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| year | consumption | change |
| 1986 | 4.90 | NA |
| 1987 | 4.90 | 0.00% |
| 1988 | 5.50 | 12.24% |
| 1989 | 5.40 | -1.82% |
| 1990 | 6.00 | 11.11% |
| 1991 | 6.60 | 10.00% |
| 1992 | 7.10 | 7.58% |
| 1993 | 6.30 | -11.27% |
| 1994 | 8.50 | 34.92% |
| 1995 | 9.00 | 5.88% |
| 1996 | 8.90 | -1.11% |
| 1997 | 5.50 | -38.20% |
| 1998 | 4.90 | -10.91% |
| 1999 | 8.30 | 69.39% |
| 2000 | 9.30 | 12.05% |
| 2001 | 9.70 | 4.30% |
| 2002 | 7.40 | -23.71% |
| 2003 | 7.90 | 6.76% |
| 2004 | 7.90 | 0.00% |
| 2005 | 7.50 | -5.06% |
| 2006 | 7.30 | -2.67% |
| 2007 | 7.70 | 5.48% |
| 2008 | 7.80 | 1.30% |
| 2009 | 8.40 | 7.69% |
| 2010 | 8.80 | 4.76% |
| 2011 | 9.20 | 4.55% |
| 2012 | 9.40 | 2.17% |
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